[issue16510] Using appropriate checks in tests

[R. David Murray]

R. David Murray added the comment:

Jason: yes, if it is broken down into small enough pieces for the module maintainer to be comfortable with the review :).  I approved Serhiy's separate patch for test_email.  I still wasn't sure about backporting, but I really don't like the 'unless' construct in test_email, so I decided to say OK.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16510>
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